Wristwatch



FIG. 1 is a top plan view of a wristwatch showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof; and,

FIG. 5 is a front perspective view thereof.

The broken line showing of a strap portion in FIGS. 1 and 2 are environmental only and form no part of the claimed design. 

The ornamental design for a wristwatch, as shown and described. 